CVE-2026-48552
Received Received - Intake

DOM-based XSS in Nagios Core and Nagios XI via jsonquery.js

Publication date: 2026-08-12

Last updated on: 2026-08-12

Assigner: VulnCheck

Description
Nagios Core before 4.5.14 and Nagios XI before 2026R1.7 are vulnerable to DOM-based cross-site scripting in jsonquery.js. Unencoded JSON string values reflected from stored fields are inserted into the DOM without sanitization, allowing attackers to run arbitrary JavaScript in the victim's browser.

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Meta Information

Published
2026-08-12
Last Modified
2026-08-12
Generated
2026-08-12
AI Q&A
2026-08-12
EPSS Evaluated
N/A
NVD
CVE-2026-48552
EUVD
EUVD-2026-57327

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
nagios nagios_core to 4.5.14 (exc)
nagios nagios_xi to 2026R1.7 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

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Executive Summary

This is a DOM-based cross-site scripting (XSS) vulnerability in Nagios Core before 4.5.14 and Nagios XI before 2026R1.7. It occurs in jsonquery.js where unencoded JSON string values from stored fields are reflected into the DOM without sanitization. Attackers can exploit this to run arbitrary JavaScript in a victim's browser.

Detection Guidance

Check Nagios Core versions before 4.5.14 and Nagios XI versions before 2026R1.7 by running version checks like 'nagios --version' or checking the web interface. Inspect jsonquery.js for unencoded JSON string reflections in stored fields.

Impact Analysis

An attacker could exploit this to steal session cookies, perform actions on behalf of the user, or redirect users to malicious sites. It may lead to unauthorized access to sensitive data or account compromise if the victim has access to Nagios interfaces.

Compliance Impact

This vulnerability could lead to unauthorized data access or modification, violating GDPR's integrity and confidentiality principles or HIPAA's safeguards for protected health information. Organizations may face compliance violations if user data is compromised.

Mitigation Strategies

Upgrade Nagios Core to version 4.5.14 or later and Nagios XI to 2026R1.7 or later. If immediate upgrade is not possible, apply input sanitization patches to jsonquery.js to encode JSON string values before DOM insertion.

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